IMHO a better question is who has the best warranty/RMA service in case things go bad. If you haven't checked already, dig into the websites and find out exactly what's entailed. Some are just pathetic and expensive, others are hassle free.

goodplay has some good points. I avoid OC'd cards they seem to have "issues" and a minimum of 2 fans on the vidcard is needed.

I've really been enjoying my reference style XFX 8GB Black Edition RX480's. I have 2 in crossfire and I am loving them. Really great cards, i cranked the fan speed up to 2500rpm and they both stay right around 75c under load.